> Talking this over with Jordan, it began to strike me that maybe the
> way to do this would be with a 3-D map, with population density
> represented by height.
>
> Offhand the simplest way to do this might be a 3-D histogram, where
> each county had a height corresponding to its population divided by
> its area (so that a large county would be flatter than a small county
> with the same pop) and each was colored appropriately.
Other than not being in color, this is similar to the map that was on the S.J.Merc front page Sunday--did it turn up on line?
John A